What is primary hypogonadism?

Primary hypogonadism occurs when the testicles themselves cannot generate sufficient testosterone, even though the pituitary gland is functioning normally and releasing appropriate levels of luteinizing hormone (LH) and follicle-stimulating hormone (FSH). The problem lies in the gonads, not in the brain's signaling system.

In primary hypogonadism, the testicles receive the correct chemical signals but fail to respond adequately. This may result from testicular injury, infection, genetic conditions, chemotherapy, or age-related decline. Since the pituitary continues sending stronger signals in an attempt to stimulate testosterone production, blood tests reveal characteristically elevated LH and FSH levels alongside low testosterone. This pattern distinguishes primary hypogonadism from secondary hypogonadism, where the pituitary itself fails to produce adequate signaling hormones.

Diagnosis depends on hormone panel results showing low free and total testosterone with high LH and FSH. For men in the Miami area seeking testosterone replacement therapy, understanding whether hypogonadism is primary versus secondary helps determine appropriate treatment strategies. TRT providers typically order these hormone tests to confirm the underlying cause before recommending therapy options.